Mouth-prop.



-PATENTBD JUNE y11, 1907.

' R. L. MAGOON. MOUTH PROP. APPLIQATION F'ILED ooT.11.19os,

' about UNITED STATES PATENT 'OEETOE MOUTH-PROF'.

Speccation of Letters Patent.

Patented June 11, 1907.

Application led October 11,1906. Serial No. 338,520.

To all wtfmt 7% mfr/ U concern-f Be it known that I, ROY L. MAGOON, aciti- Zen of the United States, residing at Graceville, in the county ofBigstone and State of Minnesota, have invented certain Anew and usefulImprovement in Mouth-Props; and I do hereby declare the following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form a part of thisspecification.

This invention relates to new and useful improvements in self-adjusting,anesthetic mouth props and comprises details of construction andcombinations and arrangements of parts which will be hereinafter fullydescribed and then specifically defined in the appended claim.

I illustrate my invention in the accompanying drawings, in which Figurel is a perspective view through my improved jaw distending device orprop, and Fig. 2 is asectional view longitudinally through the device,showing the invention locked in an adjusted position.

Reference now being had to the details of the drawings by letter, Aand Adesignate two arms, the former of which has an integral solid shankportion B with ratchet teeth O upon one edge thereof. Said shank portionis made preferably square in outline and is adapted to telescope withinthe hollow square-outlined shank D of the arm A. A spring F isinterposed between said arms and the shank portions thereof, the ofliceof which spring is to normally hold the arms at their farthest limitaway from each other. Swivelly mounted upon corresponding ends of saidarms are the jaw-engaging members G, and the opposite ends of the armsserve as means for engagement with a finger or thumb of an operator,whereby the instrument may be applied to the mouth, and the arms tiltedby pressing the two short ends of the arms together, in order to freethe end of the hollow shank of the arm A from one of the teeth upon theshank of the other arm. The teeth being free from the ends of the hollowshank, obviously the two arms may be pressed together under the tensionof the I spring for the purpose lof removing the prop from the mouth ofthe patient. It will be noted, however, that when no pressure is appliedto the two jaw-engaging swiveled members, the end of the hollow shank ofthe arm A will be thrown into engagement with one of the teeth of theshank upon the other arm, thus securely locking the arms from furthertilting movement, it being necessary to tilt back the arms so that theend of the shank portion of the arm A will be free from the tooth of theother shank, before the two jawengaging members may be freed fromcontact with the jaw of a person. The rear of the shank portion B has alongitudinal groove B in which a pin a carried by the shank D is adaptedto have a play, said groove and pin serving to hold the parts tooether.

t) By the provision of a mouth-piece made in accordance with myinvention, which device is placed between the teeth before the gas isadministered, it will be noted that the parts will fold up against thewall of the mouth so as not to interfere with the gas prop or inhalerand it will also be noted that the device may be placed between thefront teeth` and admit of the administration ofgas and then swung eitherto one side or other giving free access to all parts of the mouth.

What I claim is `A mouth'prop comprising two arms, one of which isprovided with a shank portion having ratchet teeth upon the edge thereofand provided with a longitudinal groove, the other provided with ahollow shank in which the shank with teeth thereon is adapted totelescope, the edge of the hollow shank designed to engage said teethwhereby the arms may be held from moving toward the other, a springbearing yieldingly between said arms, designed to normally hold thelatter at their farthest limit from each other, a pin upon said hollowshank adapted to engage a longitudinal groove in the shank having teeththereon, as set forth.

In testimony whereof I hereunto affix my signature in the presence oftwo witnesses.

ROY L. MAGOON.

Witnesses:

M. J. MCDONNELL, MARGARET MoDoNNELL. l I

IOO

